SEA Eagles winger Michael Robertson has been cleared of a serious head injury which had threatened his playing future.

The star back suffered concussion in the win over Newcastle three weeks ago and had suffered headaches.

He was not considered for Sundayâ€™s game against the Roosters at Brookvale Oval.

A worried Robertson consulted a neurologist earlier today to try and isolate the cause of the problem.

And the specialist diagnosed neck problems.

That was a great relief to the whole Manly club and he has been given the green light to make a welcome return to training this week.

The Manly medical staff closely monitored his condition.

â€œSomething like that you treat seriously,â€ said Sea Eagles coach Des Hasler. There were fears that Robertson was suffering from the â€œfootballerâ€™s migraineâ€ which recently sidelined Wallabies back Berrick Barnes.

Robertson first suffered the concussion after the round 19 win over Newcastle at Ausgrid Stadium and he has subsequently missed the games against Penrith and Wests Tigers.

The injury was a real setback for the left winger, who proved himself to be an ironman for the Sea Eagles after playing 139 consecutive games for the club.

Over that time he was never replaced and played every minute of every game until a knee injury put him out of the Broncos game at Suncorp Stadium in round 12.

``He is a bit frustrated with it ... itâ€™s always frustrating on the sideline,â€™â€™ Hasler said